Various realizations of leptogenesis and neutrino mass constraints

Abstract

Seven types of leptogenesis models which can lead to a successful explanation of baryogenesis are presented. Emphasis is put on the conditions which need to be fulfilled by the neutrino masses as well as by the heavy state masses. The model dependence of these conditions is discussed.Comment: Talk given at International Conference on the Seesaw Mechanism, Paris, France, 10-11 June 2004, 18 page